diff --git a/test/utils_tests/opencas-py-tests/test_cas_config_01.py b/test/utils_tests/opencas-py-tests/test_cas_config_01.py
index 8b489f4..f7841a7 100644
--- a/test/utils_tests/opencas-py-tests/test_cas_config_01.py
+++ b/test/utils_tests/opencas-py-tests/test_cas_config_01.py
@@ -331,7 +331,7 @@ def test_cas_config_get_by_id_path_not_found(mock_listdir, mock_realpath):
         ),
         (
             [
-                "1  /dev/dummy0n1    WT cleaning_policy=acp",
+                "1  /dev/dummy0n1    WT cleaning_policy=acp,lazy_startup=true",
                 "2  /dev/dummy0n2    pt ioclass_file=mango.csv",
                 "3  /dev/dummy0n3    WA cache_line_size=16",
                 ("4  /dev/dummyc    wb cache_line_size=16,"
diff --git a/test/utils_tests/opencas-py-tests/test_cas_config_cache_01.py b/test/utils_tests/opencas-py-tests/test_cas_config_cache_01.py
index 8ba35ea..d7fc572 100644
--- a/test/utils_tests/opencas-py-tests/test_cas_config_cache_01.py
+++ b/test/utils_tests/opencas-py-tests/test_cas_config_cache_01.py
@@ -204,6 +204,8 @@ def test_cache_config_from_line_missing_ioclass_file(
         "promotion_policy=Robert'); DROP TABLE Students;--",
         "promotion_policy=awlays",
         "promotion_policy=nnhit",
+        "lazy_startup=yes",
+        "lazy_startup=absolutely",
     ],
 )
 @mock.patch("os.path.exists")
@@ -240,7 +242,10 @@ def test_cache_config_from_line_parameter_validation_01(
         "ioclass_file=ioclass.csv,cache_line_size=4,cleaning_policy=nop",
         "promotion_policy=nhit",
         "promotion_policy=always",
-        "ioclass_file=ioclass.csv,cache_line_size=4,cleaning_policy=nop,promotion_policy=always",
+        "lazy_startup=true",
+        "lazy_startup=false",
+        ("ioclass_file=ioclass.csv,cache_line_size=4,cleaning_policy=nop,promotion_policy=always,"
+            "lazy_startup=true"),
     ],
 )
 @mock.patch("os.path.exists")
diff --git a/utils/opencas.py b/utils/opencas.py
index d43b0b2..38c92fd 100644
--- a/utils/opencas.py
+++ b/utils/opencas.py
@@ -253,7 +253,7 @@ class cas_config(object):
             elif param_name == 'cache_line_size':
                 self.check_cache_line_size_valid(param_value)
             elif param_name == "lazy_startup":
-                self.check_lazy_startup(param_value)
+                self.check_lazy_startup_valid(param_value)
             else:
                 raise ValueError('{0} is invalid parameter name'.format(param_name))
 
@@ -286,7 +286,7 @@ class cas_config(object):
                     cleaning_policy))
 
         def check_lazy_startup_valid(self, lazy_startup):
-            if param_value.lower() not in ["true", "false"]:
+            if lazy_startup.lower() not in ["true", "false"]:
                 raise ValueError('{0} is invalid lazy_startup value'.format(lazy_startup))
 
         def check_promotion_policy_valid(self, promotion_policy):